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• opencv cannot read MP4 file from sony camcorder

  7 juin 2016, par Jundong

  The sony camcorder recorded video in MP4 format. I am reading the file by

  import cv2
  
  vid = cv2.VideoCapture('sample.MP4')

  my OpenCV version is 2.4.8, as a Python module.

  The codec of the ’sample.MP4’ is H.264, Linear PCM.

  ffprobe sample.MP4

  returns :

  > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C0004.mp4':   Metadata:
  
  >     major_brand     : XAVC
  
  >     minor_version   : 16785407
  
  >     compatible_brands: XAVCmp42iso2
  
  >     creation_time   : 2016-06-06 13:41:51   Duration: 00:00:15.02, start: 0.000000, bitrate: 50439 kb/s
  
  >     Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709/bt709/iec61966-2-4), 1920x1080 [SAR 1:1 DAR 16:9],
  
  > 48655 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
  
  >     Metadata:
  
  >       creation_time   : 2016-06-06 13:41:51
  
  >       handler_name    : Video Media Handler
  
  >       encoder         : AVC Coding
  
  >     Stream #0:1(und): Audio: pcm_s16be (twos / 0x736F7774), 48000 Hz, 2 channels, s16, 1536 kb/s (default)
  
  >     Metadata:
  
  >       creation_time   : 2016-06-06 13:41:51
  
  >       handler_name    : Sound Media Handler
  
  >     Stream #0:2(und): Data: none (rtmd / 0x646D7472), 245 kb/s (default)
  
  >     Metadata:
  
  >       creation_time   : 2016-06-06 13:41:51
  
  >       handler_name    : Timed Metadata Media Handler 
  
  > Unsupported codec with id 0 for input stream 2

  It seems that the codec for h.264 is missing. The version of my FFmpeg is 3.0.

  I tried avconv -i sample.MP4 -c:a copy -c:v copy sample_converted.mp4 to convert the sample.MP4 to sample_converted.mp4, this command line did not work. The command ffmpeg -i sample.mp4 sample_converted.mp4 worked ; however, it compromised the video quality badly.I used an online video converter : http://www.online-convert.com/ (which output nice quality video in mp4 format, but it has size limitation for free users)
  to convert the MP4 to mp4, the command in Terminal as below :

  ffprobe 'sample_converted.mp4'

  returns

  > Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'C0001_converted.mp4':  
  
  > Metadata:
  
  >     major_brand     : isom
  
  >     minor_version   : 512
  
  >     compatible_brands: isomiso2avc1mp41
  
  >     encoder         : Lavf57.36.100   Duration: 00:00:02.02, start: 0.000000, bitrate: 16777 kb/s
  
  >     Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 1920x1080 [SAR 1:1 DAR 16:9], 16801 kb/s, 59.94
  
  > fps, 59.94 tbr, 60k tbn, 119.88 tbc (default)
  
  >     Metadata:
  
  >       handler_name    : VideoHandler
  
  >     Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
  
  >     Metadata:
  
  >       handler_name    : SoundHandler

  Obviously, the encoders, handler_names etc. of the sample.MP4 and sample_converted.mp4 are different. Any idea using FFmpeg or OpenCV to convert this raw video from camcorder to the readable format without compromising the video quality ?

• How do I convert RTSP stream for iOS browser viewing

  6 mars 2017, par humble_coder

  TL ;DR

  I need to convert full RTSP (A/V) stream from Axis IP cameras to be viewed in a fully-contained/not-full-screen div in an iOS browser. Think : "Youtube live stream as viewed from iOS browser". I’ve seen several links that hint at the issue. . .

  • Streaming via RTSP or RTP in HTML5
  • RTSP tunneled HTTP, FFMPEG
  • How can I display an RTSP video stream in a web page ?
  • Embed RTSP Stream into Browser

  . . .but they’re either "incomplete" or out of date.

  The solution must be local and remain behind site firewall (so no external services).

  MORE DETAIL

  I’m currently writing a custom "Axis IP Camera Manager" Vue/Laravel web app for a client. The initial requirements were very simple :

  1. scan network for axis devices and store addresses/info for future use

  2. display grid of MJPEG for selected camera(s).

  The initial requirements were fairly straightforward. Now, though, there are additional requirements :

  3. Record RTSP stream to [seconds] long MP4 streams.

  4. Convert an RTSP stream from AXIS IP CAMERA to something viewable in both desktop and mobile browsers with full A/V.

  I’ve successfully managed #3 by using ffmpeg to capture and store the stream to MP4. However, I’m no video aficionado, and the nature of #4 is still a bit fuzzy to me. Per my understanding I can’t watch RTSP streams in a browser in iOS, but I also can’t stream an "in-process" MP4 over HTTP. I’ve seen references to several items such as Red5, Live555, Wowza, ffserver (discontinued ?), etc. but I’m completely unfamiliar with them. In the short term, I’m looking for a quick "live" conversion solution. In the long term, I’m interested in a deeper understanding of the issue(s) at hand. Any current info/expertise/links/manuals would be appreciated.

• Merge commit ’a90905db2e6ab1840890f3a88bfd3bf008b9d886’

  16 octobre 2013, par Michael Niedermayer

  Merge commit ’a90905db2e6ab1840890f3a88bfd3bf008b9d886’
  * commit ’a90905db2e6ab1840890f3a88bfd3bf008b9d886’ :
  
    ffv1 : Assume bitdepth 0 means 8bit
  Conflicts :
  
  	libavcodec/ffv1dec.c
  Note, FFmpeg is not affected by this bug
  Merged-by : Michael Niedermayer <michaelni@gmx.at>